first cut simple code completion results

pkg/analysis_server/test/completion_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.domain.completion;
+
+import 'dart:async';
+
+import 'package:analysis_server/src/constants.dart';
+import 'package:analysis_server/src/domain_completion.dart';
+import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_services/index/index.dart' show Index;
+import 'package:analysis_services/index/local_memory_index.dart';
+import 'package:analysis_testing/reflective_tests.dart';
+import 'package:unittest/unittest.dart';
+
+import 'analysis_abstract.dart';
+
+main() {
+  group('completion', () {
+    runReflectiveTests(CompletionTest);
+  });
+}
+
+@ReflectiveTestCase()
+class CompletionTest extends AbstractAnalysisTest {
+  String completionId;
+  List<CompletionSuggestion> suggestions = [];
+  bool suggestionsDone = false;
+
+  void assertHasResult(String completion) {
+    var cs = suggestions.firstWhere((cs) => cs.completion == completion, orElse: () {
+      var completions = suggestions.map((s) => s.completion).toList();
+      fail('expected "$completion" but found\n $completions');
+    });
+  }
+
+  void assertValidId(String id) {
+    expect(id, isNotNull);
+    expect(id.isNotEmpty, isTrue);
+  }
+
+  @override
+  Index createIndex() {
+    return createLocalMemoryIndex();
+  }
+
+  Future getSuggestions(String pattern, int offset) {

[scheglov, 2014/07/17 20:40:00]

You don't use "pattern", did you mean to find offset using it?

[danrubel, 2014/07/17 21:01:14]

Yes! Good eyes. Fixed.

+    return waitForTasksFinished().then((_) {
+      Request request = new Request('0', COMPLETION_GET_SUGGESTIONS);
+      request.setParameter(FILE, testFile);
+      request.setParameter(OFFSET, offset);
+      Response response = handleSuccessfulRequest(request);
+      completionId = response.getResult(ID);
+      assertValidId(completionId);
+      return waitForSuggestions();
+    });
+  }
+
+  void processNotification(Notification notification) {
+    if (notification.event == COMPLETION_RESULTS) {
+      String id = notification.getParameter(ID);
+      assertValidId(id);
+      if (id == completionId) {
+        expect(suggestionsDone, isFalse);
+        suggestionsDone = notification.getParameter(LAST);
+        expect(suggestionsDone, isNotNull);
+        for (Map<String, Object> json in notification.getParameter(RESULTS)) {
+          expect(json, isNotNull);
+          suggestions.add(new CompletionSuggestion.fromJson(json));
+        }
+      }
+    }
+  }
+
+  @override
+  void setUp() {
+    super.setUp();
+    createProject();
+    handler = new CompletionDomainHandler(server);
+  }
+
+  Future waitForSuggestions() {
+    if (suggestionsDone) {
+      return new Future.value();
+    }
+    return new Future.delayed(Duration.ZERO, waitForSuggestions);
+  }
+
+  test_suggestions() {
+    addTestFile('''
+      import 'dart:html';

[scheglov, 2014/07/17 20:40:00]

It's up to you, but I'd start sample code with line starts, it is easier to
write this way.
And it looks almost as a normal code.

[danrubel, 2014/07/17 21:01:14]

I found it jarring to see things abruptly left aligned.
I find it easier to read this way.

[scheglov, 2014/07/17 21:09:32]

OK

+      main() {}
+    ''');
+    return getSuggestions('}', 0).then((_) {
+      assertHasResult('Object');
+      assertHasResult('HtmlElement');
+    });
+  }
+}